Sorry for the late reply, little busy at the moment (more repairs coming in again). Have not gone back to the speaker yet (although all the parts ordered have arrived). Mind enlightening us on the shorted part/component found?
...
lexwalker
Badcaps Veteran
Last Activity: 02-20-2016, 10:15 AM
Joined: 02-01-2011
Location:
-
Re: Corsair SP2500 parts information required
Sorry for the late reply, little busy at the moment (more repairs coming in again). Have not gone back to the speaker yet (although all the parts ordered have arrived). Mind enlightening us on the shorted part/component found?...
-
Re: Corsair SP2500 parts information required
Thanks! Sounds like 220pF, a little smaller than expected (for high power output unit) but will try that value.
Yups, I did use 10K. However for the capacitor, I used 1nF instead. Was working very well, but then it suddenly blew again after about an hour. Took out the PWM I.C (again) and one 10 Ohm resistor driving the MOSFET, plus possibly a signal diode as well (that 1N4148). Not sure if the MOSFET has failed though as there are no shorts detected between the pins. I think the current sense resistor survived...Leave a comment:
-
Re: Corsair SP2500 parts information required
10K was one of my guesses and looks like I was right. Thanks a bundle, mate..
If you do not have any hot air soldering equipment, then you could try de-soldering one of the transformer pins (as this capacitor is parallel to the transformer)....
Leave a comment:
-
Re: Help in finding few replacement capacitors
Degraded glue can become conductive and cause all sorts of problems. Plus degraded can also corrode and oxidise as well. I've worked on one of these Corsair SP2500 speakers: [URL="https://www.badcaps.net/forum/showthread.php?t=38320"]Badcaps Forums > Electronics Theory and Troubleshooting > Audio Equipment Discussion >Corsair SP2500 parts information required[/URL]. Would be nice if you could tell me the resistor (R930) and capacitor (C937) values mentioned in that thread (as those were burnt and blown up badly, markings...Last edited by lexwalker; 08-24-2014, 04:47 AM.Leave a comment:
-
Re: Help in finding few replacement capacitors
Beware that this speaker system may have bad degraded glue problems, not just the capacitors.
From the brand, sounds like capacitor used for speaker crossover network. There are very few bipolars to choose from. Usually I would go for Nichicon EP series...
This one is on the power supply board, if not mistaken. Corsair actually used a general purpose 105C capacitor in that section (right after the rectifiers)! If you look right under the capacitor leads at the bottom of the board, then you will find...Last edited by lexwalker; 08-23-2014, 01:22 PM.Leave a comment:
-
Re: Specifications for Caps for a Samsung Monitor
That's a very familiar board. Check the attached images...
Mostly Rubycon ZLH, Panasonic FR, Panasonic FM and Nichicon PW (whatever I have in hand at that time)...
When choosing capacitors, check the diameter, height and lead pitch as well. For LCD monitor power supplies, usually the height should not be more than 20mm (some very low profile power supply boards are restricted to 16mm maximum height) and the lead pitch is mostly 5mm. As for the diameter, depends on the available space on...Last edited by lexwalker; 08-23-2014, 01:06 PM.Leave a comment:
-
Re: TEA2025B - Heavy noise over V++
You may want to consider re-capping that PSU as well (as capacitors do age). The PCI card is attached to the motherboard, which usually has lots of ultra low impedance capacitors (mostly range anywhere from 470uF to 1000uF) along its power rails and as decoupling capacitors at vital sections (can find them often near voltage regulators and big I.Cs)...
Are you using any voltage regulators before that amplifier I.C? For the pi filter, make sure the inductor/choke has a ferrite core (in other words, not an air core type). Any...Leave a comment:
-
Re: TEA2025B - Heavy noise over V++
That could be the main cause, a noisy power supply on your desktop. The rest of the symptoms mentioned pretty much points me to that PSU...
Have you tried a pi filter? Also measure the resistance of the GND connection wires. Semi-floating ground problems can create a lot of noise...
This is an ancient capacitor. Also have quite a few of those, unused...
This is a general purpose capacitor. I would suggest using ultra low impedance/ESR capacitors such as those found on your desktop machine's...Last edited by lexwalker; 08-07-2014, 04:28 AM.Leave a comment:
-
Re: Hyundai W240D
Use a flash light and shine directly at the panell. Do you see any visible images? Can be hard to see sometimes, thus try that with the room lights off. In the first image, check the LED driver section at the bottom half of the board. Also check whether the power supply to that section is stable....
Leave a comment:
-
Re: Hyvision by Megavision MV220 LCD monitor goes blank after 0.5-1 second
Whoops! My bad... Missed this part...
Yups, there is the possibility of bad CCFLs in that LCD panel. Anyway, are both inverter boards the same one? If the inverter board is different (and driving lamps of different specifications) then it could also produce that 2 seconds to black. However if both are the same inverter boards, then a very high likelihood that one (or more) lamps are bad. You can test which lamps by hooking both panels up on that single inverter board (by swapping the lamp connections...
Leave a comment:
-
Re: Replacements for ceramic "cement" resistors on crossover?
Cement resistors? On the outside, but inside is usually its a wirewound resistor. Just look for axial leaded high power/wattage wirewound resistors. With an axial type resistor, you don't have to worry about lead pitch (just bend the leads around to fit). May be easy to find for the 10W resistor. But for the 20 Ohms 100W type, usually comes with heatsinks or in power TO-2xx style packages requiring heatsinks. You could use several axial resistors of lower wattage in parallel (but total wattage of those resistors...Leave a comment:
-
Re: Hyvision by Megavision MV220 LCD monitor goes blank after 0.5-1 second
If that 2 seconds to black still exist then there could be other factors causing it. Have you checked the resistance of both transformers on the secondary/output side? Also do check for failed MOSFETs (which looks like I.Cs)....
Leave a comment:
-
Re: M-audio AV30 speakers recap and repair
Usually I always use 1.41xVacRMS and ignoring the voltage drop across the diodes/rectifiers, thus my result would be 19.74Vdc peak voltage. Not forgetting that this is a linear power supply using a transformer which the voltages on the secondary side would correspond to the voltage on the primary side. There are also variations in voltage in different places, anywhere from 220VacRMS to 250VacRMS. The designers have to account for that. Worst case scenario, I would assume the transformer to generate up to 17.5VacRMS on mains voltage surges...Last edited by lexwalker; 08-02-2014, 04:35 PM.Leave a comment:
-
Re: Iiyama b2475hds died.
Jot down that capacitor value and order a replacement just in case. Is there any inductor and/or resistor before that capacitor? From the looks of things, first have to make sure the +5V rail is stable by replacing those Lelon capacitors on the power supply board. There could be ripples that the meter did not detect (will show as average RMS voltage). Then check again if there is still voltage fluctuations at this capacitor. You could also simply replace that capacitor just to test......
Leave a comment:
-
Re: Iiyama b2475hds died.
I agree, could also be one the regulators on the Dscaler board...
Most monitor manufacturers don't bother once its past warranty....
Leave a comment:
-
Re: LG Flatron EW224 - No backlight
Looks like part of a boost converter, with that inductor/choke then followed by a rectifier diode. Could be anywhere from 4.7uf to 47uF (or higher). The voltage rating for that capacitor could be at least 100Vdc (and higher). According to [URL="http://www.monolithicpower.com/Page/DownLoad.aspx?ListID=6858bc6b-d7f6-4e31-8587-c8a4db0ac0a4&&ItemID=30"]MP3399EY datasheet[/URL] sample schematics, its 22uF 100VDC although the inductor used was 33uH (while this board looks to be using 47uH)...Re: LG Flatron EW224 - No backlight...
Leave a comment:
-
Re: Iiyama b2475hds died.
Yes, replace them and cross your fingers that its not too late. As for replacements, check the original capacitor series for its specifications and look for capacitors that closest match to them. Sometimes capacitors can fail without showing any external signs. Usually for replacements we would recommend Panasonic FM, Panasonic FR, Rubycon ZLH, Nippon Chemicon KZE, Nichicon HD, Nichicon HE, etc......
Leave a comment:
-
Re: Iiyama b2475hds died.
I would suggest replacing those Lelon capacitors (which I predict could be on the +5V rail) first, and hopefully its not too late. Those symptoms sounds like bad power supply to the Dscaler board (where the MCU resides) and also possible beginnings of firmware corruption problems (which can be caused by bad power supply especially on that +5V rail)......
Leave a comment:
-
Re: LG Flatron EW224 - No backlight
Not good enough description. Please post pictures of that area. If possible, some partial (self-drawn) schematics as well. Is that capacitor surface mount type, or through hole type? Is this MOSFET in the inverter section?...
Leave a comment:
-
Re: Iiyama b2475hds died.
Please describe the symptoms when the monitor was not working, and/or started to malfunction. Does the power indicator LED still lights up? Does the monitor respond to any front panel control buttons?
Are those Lelon capacitors still there on the power supply board? And were they on the 5V rail? Also have you checked for any signs of dry/cold solder joints?...
Leave a comment:
No activity results to display
Leave a comment: